中国物理B ›› 2018, Vol. 27 ›› Issue (9): 97701-097701.doi: 10.1088/1674-1056/27/9/097701

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Enhanced magneto-electric effect in manganite tricolor superlattice with artificially broken symmetry

Huanyu Pei(裴环宇), Shujin Guo(郭蜀晋), Hong Yan(闫虹), Changle Chen(陈长乐), Bingcheng Luo(罗炳成), Kexin Jin(金克新)   

  1. Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2018-05-11 修回日期:2018-06-09 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: Changle Chen E-mail:chenchl@nwpu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant No. 61471301).

Enhanced magneto-electric effect in manganite tricolor superlattice with artificially broken symmetry

Huanyu Pei(裴环宇), Shujin Guo(郭蜀晋), Hong Yan(闫虹), Changle Chen(陈长乐), Bingcheng Luo(罗炳成), Kexin Jin(金克新)   

  1. Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2018-05-11 Revised:2018-06-09 Online:2018-09-05 Published:2018-09-05
  • Contact: Changle Chen E-mail:chenchl@nwpu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant No. 61471301).

摘要:

The magneto-electric effect in magnetic materials has been widely investigated, but obtaining an enhanced magneto-electric effect is challenging. In this study, tricolor superlattices composed of manganese oxides–Pr0.9Ca0.1MnO3, La0.9Sr0.1MnO3, and La0.9Sb0.1MnO3–on (001)-oriented Nb:SrTiO3 substrates with broken space-inversion and time-reversal symmetries are designed. Regarding the electric polarization in the hysteresis loops of the superlattices at different external magnetic fields, both coercive electric field Ec and remnant polarization intensity Pr clearly show strong magnetic-field dependences. At low temperatures (<120 K), a considerable magneto-electric effect in the well-defined tricolor superlattice is observed that is absent in the single compounds. Both maxima of the magneto-electric coupling coefficients ΔEc and ΔPr appear at 30 K. The magnetic dependence of the dielectric constant further supports the magneto-electric effect. Moreover, a dependence of the magneto-electric effect on the periodicity of the superlattices with various structures is observed, which indicates the importance of interfaces. Our experimental results verify previous theoretical results regarding magneto-electric interactions, thereby paving the way for the design and development of novel magneto-electric devices based on manganite ferromagnets.

关键词: multiferroic, magneto-electric effect, superlattice

Abstract:

The magneto-electric effect in magnetic materials has been widely investigated, but obtaining an enhanced magneto-electric effect is challenging. In this study, tricolor superlattices composed of manganese oxides–Pr0.9Ca0.1MnO3, La0.9Sr0.1MnO3, and La0.9Sb0.1MnO3–on (001)-oriented Nb:SrTiO3 substrates with broken space-inversion and time-reversal symmetries are designed. Regarding the electric polarization in the hysteresis loops of the superlattices at different external magnetic fields, both coercive electric field Ec and remnant polarization intensity Pr clearly show strong magnetic-field dependences. At low temperatures (<120 K), a considerable magneto-electric effect in the well-defined tricolor superlattice is observed that is absent in the single compounds. Both maxima of the magneto-electric coupling coefficients ΔEc and ΔPr appear at 30 K. The magnetic dependence of the dielectric constant further supports the magneto-electric effect. Moreover, a dependence of the magneto-electric effect on the periodicity of the superlattices with various structures is observed, which indicates the importance of interfaces. Our experimental results verify previous theoretical results regarding magneto-electric interactions, thereby paving the way for the design and development of novel magneto-electric devices based on manganite ferromagnets.

Key words: multiferroic, magneto-electric effect, superlattice

中图分类号:  (Multiferroic/magnetoelectric films)

  • 77.55.Nv
75.85.+t (Magnetoelectric effects, multiferroics) 77.55.Px (Epitaxial and superlattice films)